Regular Expressions - Use Capture Groups to Search and Replace

[sudoromeo]

Tell us what’s happening:
Describe your issue in detail here.
what does $ actually do in this case?
Could someone explain me?

Your code so far

let str = "one two three";
let fixRegex = /(\w+)\s(\w+)\s(\w+)/; // Change this line
let replaceText = "$3 $2 $1"; // Change this line
let result = str.replace(fixRegex, replaceText);

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Challenge: Regular Expressions - Use Capture Groups to Search and Replace

Link to the challenge:

freeCodeCamp.org

[hbar1st]

@sudoromeo

what does $ actually do in this case?

The exercise describes what the $ is for

You can also access capture groups in the replacement string with dollar signs ($).

"Code Camp".replace(/(\w+)\s(\w+)/, '$2 $1');

The replace call would return the string Camp Code.

So the $2 maps to the 2nd capture group in the example, and $1 maps to the first capture group in the example.

[Miracle]

[ILM]

the arrows between second and third line are not correct, $3 references the third capture group, not the first one